Consistent variable name

src/freedombone-controlpanel

         fi
         if [ $ip_addresses_have_changed ]; then
             write_config_param "NETWORK_IS_STATIC" "1"
-            write_config_param "STATIC_IP_ADDRESS" "$NEW_STATIC_IP"
+            write_config_param "LOCAL_NETWORK_STATIC_IP_ADDRESS" "$NEW_STATIC_IP"
             write_config_param "ROUTER_IP_ADDRESS" "$NEW_STATIC_GATEWAY"
 
             email_change_relay "$NEW_STATIC_IP"

src/freedombone-utils-wifi

         echo '#this line must always be here' >> /etc/network/interfaces
         echo 'iface default inet dhcp' >> /etc/network/interfaces
     else
-        read_config_param "STATIC_IP_ADDRESS"
+        read_config_param "LOCAL_NETWORK_STATIC_IP_ADDRESS"
         read_config_param "ROUTER_IP_ADDRESS"
         echo '#static address' >> /etc/network/interfaces
         echo 'iface default inet static' >> /etc/network/interfaces
-        echo "    address ${STATIC_IP_ADDRESS}" >> /etc/network/interfaces
+        echo "    address ${LOCAL_NETWORK_STATIC_IP_ADDRESS}" >> /etc/network/interfaces
         echo '    netmask 255.255.255.0' >> /etc/network/interfaces
         echo "    gateway ${ROUTER_IP_ADDRESS}" >> /etc/network/interfaces
     fi